.tab{
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 999;
  height: 40px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-weight: 550;
  font-size: 16px;
  background-color: #ff5777;
  color: #fff;
}